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Spatial trends in Salmonella infection in pigs in Spain

Frontiers in veterinary science publish this investigation article

June 23rd, 2020

Salmonella is one of the most important foodborne pathogens worldwide. Its main reservoirs are poultry and pigs, in which infection is endemic in many countries. Spain has one of the largest pig populations in the world. Even though Salmonella infection is commonly detected in pig farms, its spatial distribution at the national level is poorly understood. Here we aimed to report the spatial distribution of Salmonella-positive pig farms in Spain and investigate the presence of potential spatial trends over a 17-year period.
For this, data on samples from pigs tested for Salmonella in 2002-2013, 2015, 2017, and 2019 as part of the Spanish Veterinary Antimicrobial Resistance Surveillance programme, representing 3,730 farms were analysed.
The spatial distribution and clustering of Salmonella-positive pig farms at the province level were explored using spatial empirical Bayesian smoothing and global Moran’s I, local Moran’s I and the Poisson model of the spatial scan statistics. Bayesian spatial regression using a reparameterised Besag-York-Mollié Poisson model (BYM2 model) was then performed to quantify the presence of spatially structured and unstructured effects while accounting for the effect of potential risk factors for Salmonella infection at the province level.
The overall proportion of Salmonella-positive farms was 37.8% (95% confidence interval: 36.2-39.4). Clusters of positive farms were detected in the East and Northeast of Spain. The Bayesian spatial regression revealed a West-to-East increase in the risk of Salmonella infection at the province level, with 65.2% (50% highest density interval: 70−100.0%) of this spatial pattern being explained by the spatially structured component.
Our results demonstrate the existence of a spatial variation in the risk of Salmonella infection in pig farms at the province level in Spain. This information can help to optimise risk-based Salmonella surveillance programmes in Spain, although further research to identify farm-level factors explaining this pattern are needed




Teng KT., Martinez-Aviles M., Ugarte-Ruiz M., Barcena C., de la Torre A., Lopez G., Moreno MA., Dominguez L. and Alvarez J..




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Spatial trends in Salmonella infection in pigs in Spain

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Spatial trends in Salmonella infection in pigs in Spain


Participants:

Universidad ComplutenseServicio de Zoonosis de Transmisión Alimentaria y Resistencia a Antimicrobianos (ZTA). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

Universidad ComplutenseDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM).

Instituto Nacional de Investigación y Tecnología Agraria y AlimentariaInstituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA).

Ministerio de Agricultura, Pesca y AlimentaciónMinisterio de Agricultura, Pesca y Alimentación (MAPA).







Frontiers in veterinary science
FACTOR YEAR Q
2.245 2019

NLMID: 101666658

PMID: 32656254

ISSN: 2297-1769



TITLE: Spatial trends in Salmonella infection in pigs in Spain


JOURNAL: Front Vet Sci


NUMERACIÓN: 7:345


AÑO: 2020


PUBLISHER: Lausanne : Frontiers Media S.A


AUTHORS: Teng KT., Martinez-Aviles M., Ugarte-Ruiz M., Barcena C., de la Torre A., Lopez G., Moreno MA., Dominguez L. and Alvarez J..


VISAVET PARTICIPANTS


2nd
Marta Martínez Avilés
3rd
María Ugarte Ruiz
4th
Carmen Bárcena Asensio
7th
Miguel Ángel Moreno Romo
8th
Lucas Domínguez Rodríguez
Last
Julio Álvarez Sánchez

DOI: https://doi.org/ 10.3389/fvets.2020.00345


CITE THIS PUBLICATION:

Teng KT., Martinez-Aviles M., Ugarte-Ruiz M., Barcena C., de la Torre A., Lopez G., Moreno MA., Dominguez L. and Alvarez J. Spatial trends in Salmonella infection in pigs in Spain. Frontiers in veterinary science. 7:345. 2020. (A). ISSN: 2297-1769. DOI: 10.3389/fvets.2020.00345


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